Ponències/Comunicacions de congressoshttp://hdl.handle.net/2117/5302
Sat, 10 Dec 2016 03:07:40 GMT2016-12-10T03:07:40ZA multivariate model of NW Mediterranean extreme events at present and future climate: hydrodynamics, energy and durationhttp://hdl.handle.net/2117/76995
A multivariate model of NW Mediterranean extreme events at present and future climate: hydrodynamics, energy and duration
Lin Ye, Jue; García León, Manuel; Gracia Garcia, Vicente; Sánchez-Arcilla Conejo, Agustín
A statistical model of the future wave-extreme-climate under the RCP8.5 Climatic-Change scenario was required. Some variables of interest are energy, unitary energy, peak wave-period, duration, wave direction and growth-decay rates. Hierarchical Archimedean Copulae (HAC) and generalized Pareto distributions (GPD) have been used to model the first four variables, whereas the rest are characterized as individual variables. By examining the statistical model, the most relevant outcomes for future climate are less durable and energetic but more intense storms in the near and far future, an increase of wave peak-period in the far-future at the Roses bay, and a detachment of peak period from energy, unitary energy and duration in the far-future at the Ebre Delta.
Mon, 21 Sep 2015 14:37:12 GMThttp://hdl.handle.net/2117/769952015-09-21T14:37:12ZLin Ye, JueGarcía León, ManuelGracia Garcia, VicenteSánchez-Arcilla Conejo, AgustínA statistical model of the future wave-extreme-climate under the RCP8.5 Climatic-Change scenario was required. Some variables of interest are energy, unitary energy, peak wave-period, duration, wave direction and growth-decay rates. Hierarchical Archimedean Copulae (HAC) and generalized Pareto distributions (GPD) have been used to model the first four variables, whereas the rest are characterized as individual variables. By examining the statistical model, the most relevant outcomes for future climate are less durable and energetic but more intense storms in the near and far future, an increase of wave peak-period in the far-future at the Roses bay, and a detachment of peak period from energy, unitary energy and duration in the far-future at the Ebre Delta.Coastal sustainability for uncertain futures: a Spanish Mediterranean case from the RISES-AM- projecthttp://hdl.handle.net/2117/76320
Coastal sustainability for uncertain futures: a Spanish Mediterranean case from the RISES-AM- project
Sánchez-Arcilla Conejo, Agustín; Sierra Pedrico, Juan Pablo; Gracia Garcia, Vicente; García León, Manuel; Jiménez Quintana, José Antonio; Mösso Aranda, César; Valdemoro Garcia, Herminia
This document presents the impacts of future climatic conditions as a function of coastal typology. The impact assessment is carried out at decadal and storm scales showing how such a combination produces the worst levels of damage. From here the implications at a “predictive” scale up to 10 years and at a projective scale up to 10 decades is considered. The resulting impact consequences, normalized by their respective probability of occurrence allow calculating risk levels. For the more clear vulnerability hotspots the proposal in the paper is to use natural accretion mechanisms where the natural power of meteorological and oceanographic events can be put to use to contribute sedimentary inputs to a starving coastal zone. In the same manner the natural adaptive capacity of coastal systems could be enhanced if natural accommodation space is provided or considered for present and future planning. The paper ends with some conclusions on the development of a pathway for efficient responses to climatic change.
Fri, 24 Jul 2015 12:13:56 GMThttp://hdl.handle.net/2117/763202015-07-24T12:13:56ZSánchez-Arcilla Conejo, AgustínSierra Pedrico, Juan PabloGracia Garcia, VicenteGarcía León, ManuelJiménez Quintana, José AntonioMösso Aranda, CésarValdemoro Garcia, HerminiaThis document presents the impacts of future climatic conditions as a function of coastal typology. The impact assessment is carried out at decadal and storm scales showing how such a combination produces the worst levels of damage. From here the implications at a “predictive” scale up to 10 years and at a projective scale up to 10 decades is considered. The resulting impact consequences, normalized by their respective probability of occurrence allow calculating risk levels. For the more clear vulnerability hotspots the proposal in the paper is to use natural accretion mechanisms where the natural power of meteorological and oceanographic events can be put to use to contribute sedimentary inputs to a starving coastal zone. In the same manner the natural adaptive capacity of coastal systems could be enhanced if natural accommodation space is provided or considered for present and future planning. The paper ends with some conclusions on the development of a pathway for efficient responses to climatic change.Experimental RAO’s analysis of a monolithic concrete spar structure for offshore floating wind turbineshttp://hdl.handle.net/2117/28422
Experimental RAO’s analysis of a monolithic concrete spar structure for offshore floating wind turbines
Campos Hortigüela, Alexis; Molins i Borrell, Climent; Gironella Cobos, Xavier; Trubat Casal, Pau; Alarcón Fernández, Daniel
Nowadays the offshore wind energy market is clearly oriented to be extended around the world. Bottom fixed solutions for supporting offshore wind turbines are useful in shallow waters which are available in a limited extent unless a continental shelf exists. Considering the Oil & Gas background knowledge, move from bottom fixed solutions to floating solutions is not a
technical challenge, but the cost of each structure in terms of industry profit is currently the main issue for its commercial implementation. That point has induced huge research efforts on the topic.
Recently, a new concept consisting of a monolithic concrete SPAR platform was experimentally and numerically studied in the framework of the AFOSP KIC-InnoEnergy project (Alternative Floating Platform Designs for Offshore Wind
Towers using Low Cost Materials). The studies comprised a set of hydrodynamic tests performed in the CIEM wave flume facility at UPC, with a 1:100 scaled model assuming Froude similitude.
The whole test campaign includes free decay tests, RAO’s determination, regular and irregular waves with and without wind mean force. For the determination of the platform RAO’s, a set of 21 regular waves trains with periods ranging from 0.8s up to 4.8s were applied. The 6 DOF motions of the platform were measured with an infrared stereoscopic vision system.
In this paper, a summary of pitch and heave RAO’s tests will be presented with the main objective to calibrate and validate the accuracy of the Morison-based numerical model for floating wind turbine platforms developed at the Universitat Politècnica de Catalunya.
Because the wave flume spatial constraints, both Airy and Stokes wave theories are necessary to reproduce the correct wave kinematics. The numerical model includes both theories and a comparison between them has been done, checking the validity range of each one. The simulations revealed a reasonable good agreement with the experimental results, as well with the computed RAO’s in commercial software.
Fri, 26 Jun 2015 08:54:45 GMThttp://hdl.handle.net/2117/284222015-06-26T08:54:45ZCampos Hortigüela, AlexisMolins i Borrell, ClimentGironella Cobos, XavierTrubat Casal, PauAlarcón Fernández, DanielNowadays the offshore wind energy market is clearly oriented to be extended around the world. Bottom fixed solutions for supporting offshore wind turbines are useful in shallow waters which are available in a limited extent unless a continental shelf exists. Considering the Oil & Gas background knowledge, move from bottom fixed solutions to floating solutions is not a
technical challenge, but the cost of each structure in terms of industry profit is currently the main issue for its commercial implementation. That point has induced huge research efforts on the topic.
Recently, a new concept consisting of a monolithic concrete SPAR platform was experimentally and numerically studied in the framework of the AFOSP KIC-InnoEnergy project (Alternative Floating Platform Designs for Offshore Wind
Towers using Low Cost Materials). The studies comprised a set of hydrodynamic tests performed in the CIEM wave flume facility at UPC, with a 1:100 scaled model assuming Froude similitude.
The whole test campaign includes free decay tests, RAO’s determination, regular and irregular waves with and without wind mean force. For the determination of the platform RAO’s, a set of 21 regular waves trains with periods ranging from 0.8s up to 4.8s were applied. The 6 DOF motions of the platform were measured with an infrared stereoscopic vision system.
In this paper, a summary of pitch and heave RAO’s tests will be presented with the main objective to calibrate and validate the accuracy of the Morison-based numerical model for floating wind turbine platforms developed at the Universitat Politècnica de Catalunya.
Because the wave flume spatial constraints, both Airy and Stokes wave theories are necessary to reproduce the correct wave kinematics. The numerical model includes both theories and a comparison between them has been done, checking the validity range of each one. The simulations revealed a reasonable good agreement with the experimental results, as well with the computed RAO’s in commercial software.Experiments on a scale model of a monolithic concrete spar for floating wind turbineshttp://hdl.handle.net/2117/28421
Experiments on a scale model of a monolithic concrete spar for floating wind turbines
Campos Hortigüela, Alexis; Molins i Borrell, Climent; Gironella Cobos, Xavier; Trubat Casal, Pau; Alarcón Fernández, Daniel
Preliminary studies of a concept consisting of a monolithic concrete SPAR platform were presented in 2014. The studies were performed in the framework of the AFOSP KIC-InnoEnergy project (Alternative Floating Platform Designs for Offshore Wind Towers using Low Cost Materials) showing significant costs reduction. The experimental phase of the project was developed during 2014.
The experiments comprised a set of hydrodynamic tests performed in the CIEM wave flume facility at the Universitat Politècnica de Catalunya (UPC), with a 1:100 scale model assuming Froude similitude. The complete experimental campaign included free decay tests, a set of 22 regular wave trains of different periods to determine the RAO’s and another set of 21 regular and irregular wave trains in conjunction with a mechanical wind device, simulating the mean thrust force exerted by the wind turbine.
To adjust the weight of the whole system, a set of adjustable weights inside de scale model were designed assuring such properties, particularly the
pitch/roll inertia. The scaled model of the mooring system was carefully studied because the constraints in width of the flume facility. A mechanical wind device
was also specifically designed to ensure an averaged force at the top of the model, simulating the effect of the mean rotor thrust force.
A detailed description of the methodology for the experimental campaign and a summary of the experimental results are presented.
Fri, 26 Jun 2015 08:39:57 GMThttp://hdl.handle.net/2117/284212015-06-26T08:39:57ZCampos Hortigüela, AlexisMolins i Borrell, ClimentGironella Cobos, XavierTrubat Casal, PauAlarcón Fernández, DanielPreliminary studies of a concept consisting of a monolithic concrete SPAR platform were presented in 2014. The studies were performed in the framework of the AFOSP KIC-InnoEnergy project (Alternative Floating Platform Designs for Offshore Wind Towers using Low Cost Materials) showing significant costs reduction. The experimental phase of the project was developed during 2014.
The experiments comprised a set of hydrodynamic tests performed in the CIEM wave flume facility at the Universitat Politècnica de Catalunya (UPC), with a 1:100 scale model assuming Froude similitude. The complete experimental campaign included free decay tests, a set of 22 regular wave trains of different periods to determine the RAO’s and another set of 21 regular and irregular wave trains in conjunction with a mechanical wind device, simulating the mean thrust force exerted by the wind turbine.
To adjust the weight of the whole system, a set of adjustable weights inside de scale model were designed assuring such properties, particularly the
pitch/roll inertia. The scaled model of the mooring system was carefully studied because the constraints in width of the flume facility. A mechanical wind device
was also specifically designed to ensure an averaged force at the top of the model, simulating the effect of the mean rotor thrust force.
A detailed description of the methodology for the experimental campaign and a summary of the experimental results are presented.Erosive and accretive mobile bed experiments in large scale testshttp://hdl.handle.net/2117/28079
Erosive and accretive mobile bed experiments in large scale tests
Cáceres Rabionet, Iván; Sánchez-Arcilla Conejo, Agustín
Traditionally data and analysis for erosive or Accretive wave conditions have been carried out at relatively small scales and without enough spatial coverage or resolution. This limits the in depth analysis and does not allow an undistorted (with respect to NATURE) and reliable analysis. In this paper we shall present a sample of 1 Erosive and 2 different Accretive wave sequences acting on a large scale beach profile experiment carried out at the CIEM wave flume in Barcelona. The experimental intervals are large enough to properly assess the impulsive response to large wave events and the underlying trends. We shall be looking at collocated hydro and morphodynamic time series with emphasis on the time scale of the drivers and responses. The subsequent analysis will deal with the different net transport rates between both Accretive conditions and within the different Accretion pattern of both tested conditions. We shall examine the velocity and acceleration skewness of the measured time series at two different points along the bar, while the net transport of the bar decrease with the adaptation of the profile to a more stable situation. The resulting beach behavior will be discussed as a function of the driving hydrodynamics and original beach settings.
Wed, 27 May 2015 16:53:56 GMThttp://hdl.handle.net/2117/280792015-05-27T16:53:56ZCáceres Rabionet, IvánSánchez-Arcilla Conejo, AgustínTraditionally data and analysis for erosive or Accretive wave conditions have been carried out at relatively small scales and without enough spatial coverage or resolution. This limits the in depth analysis and does not allow an undistorted (with respect to NATURE) and reliable analysis. In this paper we shall present a sample of 1 Erosive and 2 different Accretive wave sequences acting on a large scale beach profile experiment carried out at the CIEM wave flume in Barcelona. The experimental intervals are large enough to properly assess the impulsive response to large wave events and the underlying trends. We shall be looking at collocated hydro and morphodynamic time series with emphasis on the time scale of the drivers and responses. The subsequent analysis will deal with the different net transport rates between both Accretive conditions and within the different Accretion pattern of both tested conditions. We shall examine the velocity and acceleration skewness of the measured time series at two different points along the bar, while the net transport of the bar decrease with the adaptation of the profile to a more stable situation. The resulting beach behavior will be discussed as a function of the driving hydrodynamics and original beach settings.Natural accretion mechanisms: the role in future coastal sustainabilityhttp://hdl.handle.net/2117/28078
Natural accretion mechanisms: the role in future coastal sustainability
Sánchez-Arcilla Conejo, Agustín; Gracia Garcia, Vicente; García León, Manuel; Jiménez Quintana, José Antonio; Cáceres Rabionet, Iván; Valdemoro Garcia, Herminia
Although recent research has focused on erosive processes, natural accretion mechanisms have been known for many years, and they can provide an efficient solution to deal with sediment starved coasts. In this paper we shall review natural accretion mechanisms linked to sediment over-wash associated to wave storms in the Spanish Mediterranean. The analysis will encompass general marine flooding in a deltaic coastal fringe, for wide and narrow cross-shore profiles. The analyses will prove the natural capability of dynamic coasts to act in a resilient manner for cases of sediment starvation, such as it is the situation for many deltas and low-lying coasts in developed or developing countries.
Wed, 27 May 2015 16:48:53 GMThttp://hdl.handle.net/2117/280782015-05-27T16:48:53ZSánchez-Arcilla Conejo, AgustínGracia Garcia, VicenteGarcía León, ManuelJiménez Quintana, José AntonioCáceres Rabionet, IvánValdemoro Garcia, HerminiaAlthough recent research has focused on erosive processes, natural accretion mechanisms have been known for many years, and they can provide an efficient solution to deal with sediment starved coasts. In this paper we shall review natural accretion mechanisms linked to sediment over-wash associated to wave storms in the Spanish Mediterranean. The analysis will encompass general marine flooding in a deltaic coastal fringe, for wide and narrow cross-shore profiles. The analyses will prove the natural capability of dynamic coasts to act in a resilient manner for cases of sediment starvation, such as it is the situation for many deltas and low-lying coasts in developed or developing countries.Modelling barrier beaches under storms with XBEACH: The case of the Trabucador barhttp://hdl.handle.net/2117/27875
Modelling barrier beaches under storms with XBEACH: The case of the Trabucador bar
García León, Manuel; Solé, J.M.; Gracia Garcia, Vicente; Alomar, Marta; Tolosana Delgado, Raimon; Fernández, J.; Pallarès López, Elena; Jiménez Quintana, José Antonio; Sánchez-Arcilla Conejo, Agustín
Mon, 11 May 2015 13:40:41 GMThttp://hdl.handle.net/2117/278752015-05-11T13:40:41ZGarcía León, ManuelSolé, J.M.Gracia Garcia, VicenteAlomar, MartaTolosana Delgado, RaimonFernández, J.Pallarès López, ElenaJiménez Quintana, José AntonioSánchez-Arcilla Conejo, AgustínModelación numérica de tejados en áreas urbanashttp://hdl.handle.net/2117/27862
Modelación numérica de tejados en áreas urbanas
ARAGÓN HERNÁNDEZ, JOSÉ LUÍS; Bladé i Castellet, Ernest; CRUZ GERÓN, JUAN ANSBERTO; De Luna Cruz, Faustino; Fuentes Mariles, Oscar Arturo
Entre los componentes del drenaje urbano superficial se encuentran los tejados. El flujo de la lluvia que cae sobre estos, puede ser descargado a las calles, colectores, o en ambos. En este trabajo se presenta un modelo numérico para la simulación del flujo sobre los tejados. Para ello, cuenta con dos alternativas, el empleo de las ecuaciones de la onda cinemática en una dimensión y las ecuaciones de aguas poco profundas en dos dimensiones. Dichas alternativas tienen ventajas y desventajas. El modelo se valida con un caso de referencia y se aplica a una cuenca urbana. Los resultados obtenidos muestran que el uso de las ecuaciones de aguas poco profundas en do
dimensiones consume más tiempo, debido a una mayor numero de elementos de la malla de cálculo, además, puede presentar zonas de solución no válidas. En cambio, el empleo de las ecuaciones de la
onda cinemática en una dimensión consume menos tiempo, pero implica suponer flujo en una dirección.
Fri, 08 May 2015 18:57:50 GMThttp://hdl.handle.net/2117/278622015-05-08T18:57:50ZARAGÓN HERNÁNDEZ, JOSÉ LUÍSBladé i Castellet, ErnestCRUZ GERÓN, JUAN ANSBERTODe Luna Cruz, FaustinoFuentes Mariles, Oscar ArturoEntre los componentes del drenaje urbano superficial se encuentran los tejados. El flujo de la lluvia que cae sobre estos, puede ser descargado a las calles, colectores, o en ambos. En este trabajo se presenta un modelo numérico para la simulación del flujo sobre los tejados. Para ello, cuenta con dos alternativas, el empleo de las ecuaciones de la onda cinemática en una dimensión y las ecuaciones de aguas poco profundas en dos dimensiones. Dichas alternativas tienen ventajas y desventajas. El modelo se valida con un caso de referencia y se aplica a una cuenca urbana. Los resultados obtenidos muestran que el uso de las ecuaciones de aguas poco profundas en do
dimensiones consume más tiempo, debido a una mayor numero de elementos de la malla de cálculo, además, puede presentar zonas de solución no válidas. En cambio, el empleo de las ecuaciones de la
onda cinemática en una dimensión consume menos tiempo, pero implica suponer flujo en una dirección.Testing water pollution in a two layer aquiferhttp://hdl.handle.net/2117/27222
Testing water pollution in a two layer aquifer
García León, Manuel; Lin Ye, Jue
Water bodies around urban areas may be polluted with chemical elements from urban or industrial activities. We study the case of underground water pollution. This is a serious problem, since under-
ground water is high qualified drinkable water in a world where this natural resource is increasingly reduced. This study is focused on a two-layer aquifer. If the superficial layer is contaminated, the deeper layer could be spoiled as well. This contribution checks the equality of the mean or centered composition of the two layers, with the aim of inferring their possible hydraulic conectivity.
The data to be examined are different hydro-chemical components of water, such as nitrates and nitrites (related to nitrate/nitrite poisoning of animal stock), tensoactives (toxic to the ecosystem) or potassium (it promotes eutrophization of the water), represented in mg/l. As the data are compositional, we can group the pertinent elements and compare them applying ilr transformation. The ilr transformation is used for simplicity when comparing compositional vectors. MANOVA (Multivariate
Analysis of Variance) is applied on the transformed data from the two layers. This provides a hypothesis test to discern whether the two aquifer layers can be considered a homogeneous continuum or, on the contrary, they should be considered as isolated layers. An illustrative example is presented. Used data sets, being synthetic, are inspired by a real case. These analyses suggest that the two aquifers are connected.
Thu, 09 Apr 2015 15:32:12 GMThttp://hdl.handle.net/2117/272222015-04-09T15:32:12ZGarcía León, ManuelLin Ye, JueWater bodies around urban areas may be polluted with chemical elements from urban or industrial activities. We study the case of underground water pollution. This is a serious problem, since under-
ground water is high qualified drinkable water in a world where this natural resource is increasingly reduced. This study is focused on a two-layer aquifer. If the superficial layer is contaminated, the deeper layer could be spoiled as well. This contribution checks the equality of the mean or centered composition of the two layers, with the aim of inferring their possible hydraulic conectivity.
The data to be examined are different hydro-chemical components of water, such as nitrates and nitrites (related to nitrate/nitrite poisoning of animal stock), tensoactives (toxic to the ecosystem) or potassium (it promotes eutrophization of the water), represented in mg/l. As the data are compositional, we can group the pertinent elements and compare them applying ilr transformation. The ilr transformation is used for simplicity when comparing compositional vectors. MANOVA (Multivariate
Analysis of Variance) is applied on the transformed data from the two layers. This provides a hypothesis test to discern whether the two aquifer layers can be considered a homogeneous continuum or, on the contrary, they should be considered as isolated layers. An illustrative example is presented. Used data sets, being synthetic, are inspired by a real case. These analyses suggest that the two aquifers are connected.Experimental studies on 3D impulse waves generated by rapid landslides and debris flowshttp://hdl.handle.net/2117/27188
Experimental studies on 3D impulse waves generated by rapid landslides and debris flows
Bregoli, Francesco; Bateman Pinzón, Allen; Medina Iglesias, Vicente César de; Gómez Cortés, Diego
The input of material in a water body at high velocity, like a landslide or a debris flow, can induce a big, abnormal wave, known as impulse wave or landslide tsunami wave. Once the wave is triggered, the effects on the shorelines are devastating and moreover unlikely predicted. Disastrous past events have been extensively analysed but remain too scarce to properly describe the process. Experiments of impulse waves have been carried out by various authors. The present work was planned to fill the lack of experimental data on the effect of granular material falling in a water basin, exploring new ranges of parameters governing this process.
It is introduced a new experimental set up installed in the fluvial-morphodynamic laboratory of the GITS team in the Technical University of Catalonia. The experimental device consists of a wheeled box sliding on a steeply sloped flume and releasing granular material, which ends up in a basin. The system allows reaching a relatively high velocity of the granular mass for a correct simulation of the process’s behaviour.
A system has been defined in order to be able to measure the velocity of the granular material and its depth, as well as the propagation of the waves, with high-speed cameras and a laser grid system. The dynamic forces of the granular mass’ impact on different surfaces is also measured and related to the studied phenomenon.
Several experiments’ runs have been carried out. First results are here presented and analysed.
Wed, 08 Apr 2015 17:12:07 GMThttp://hdl.handle.net/2117/271882015-04-08T17:12:07ZBregoli, FrancescoBateman Pinzón, AllenMedina Iglesias, Vicente César deGómez Cortés, DiegoThe input of material in a water body at high velocity, like a landslide or a debris flow, can induce a big, abnormal wave, known as impulse wave or landslide tsunami wave. Once the wave is triggered, the effects on the shorelines are devastating and moreover unlikely predicted. Disastrous past events have been extensively analysed but remain too scarce to properly describe the process. Experiments of impulse waves have been carried out by various authors. The present work was planned to fill the lack of experimental data on the effect of granular material falling in a water basin, exploring new ranges of parameters governing this process.
It is introduced a new experimental set up installed in the fluvial-morphodynamic laboratory of the GITS team in the Technical University of Catalonia. The experimental device consists of a wheeled box sliding on a steeply sloped flume and releasing granular material, which ends up in a basin. The system allows reaching a relatively high velocity of the granular mass for a correct simulation of the process’s behaviour.
A system has been defined in order to be able to measure the velocity of the granular material and its depth, as well as the propagation of the waves, with high-speed cameras and a laser grid system. The dynamic forces of the granular mass’ impact on different surfaces is also measured and related to the studied phenomenon.
Several experiments’ runs have been carried out. First results are here presented and analysed.